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diff --git a/docs/04_Developer_Guides/images/application_switching.msc b/docs/04_Developer_Guides/images/application_switching.msc
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+++ b/docs/04_Developer_Guides/images/application_switching.msc
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+#!/usr/bin/mscgen -Tpng
+
+msc {
+ hscale="1.5";
+
+ u [label = "touch/pointer event" ],
+ l [label = "launcher app" ],
+ s [label = "runtime/shell-client"],
+ a [label = "applaunchd" ],
+ g [label = "gRPC-proxy" ],
+ c [label = "compositor" ],
+ d [label = "libsystemd"];
+
+ |||;
+
+ --- [label = "initial phase - subscribe for signal/status events, assume app_id already started" ];
+
+ s >> a [label = "subscribe for applaunchd GetStatusEvents"];
+
+ --- [label = "handling of application switching" ];
+
+ u => l [label = "tapShortCut(appid)" ];
+ l => a [label = "StartApplication(appid)"];
+ a => d [label = "start application's systemd unit"];
+ d => a [label = "return status from starting systemd unit"];
+ a => s [label = "StartResponse(status = TRUE)"];
+ a => s [label = "StatusResponse(app_id, 'started')"];
+ s => c [label = "activate_app(app_id)"];
+}